title: Alternative reagents for chemical noise reduction in liquid chromatography-mass spectrometry using selective ion-molecule reactions.
abstract: Reduction of ionic chemical background noise based on selective gas-phase reactions with chosen neutral reagents has been proven to be a very promising approach in liquid chromatography-mass spectrometry (LC-MS). In this study further investigations on alternative reagents including the disulfides (dimethyl disulfide, diethyl disulfide, methyl propyl disulfide), dimethyl trisulfide, ethylene oxide, and butadiene monoxide, for example, have been carried out. Tandem mass spectrometric studies of ion/molecule reactions indicate that-besides dimethyl disulfide-ethylene oxide and butadiene monoxide also exhibit very efficient reactions with background ions. Furthermore, it is confirmed that the reactions are very selective according to the test with some analyte ions. In contrast to its rapid reactions with background ions, ethylene oxide does not react, or reacts much less, with these analytes. Therefore, it can be used as an alternative reagent for noise reduction. Although reactions of the other tested neutral reagents with background ions are evaluated, they are generally not suitable as reagents for this purpose because of lack of reactivity or dramatic ion losses during reactions.
authors.affiliation: Institute of Analytical Chemistry and Radiochemistry, Graz University of Technology, Graz, Austria. X.guo@tugraz.at
authors.forename: Xinghua
authors.initials: X
authors.lastname: Guo
authors.forename: Andries P
authors.initials: AP
authors.lastname: Bruins
authors.forename: Thomas R
authors.initials: TR
authors.lastname: Covey
authors.forename: Martin
authors.initials: M
authors.lastname: Trötzmüller
authors.forename: Ernst
authors.initials: E
authors.lastname: Lankmayr
mesh_terms: D002853:Chromatography, Liquid / Q000379:methods*; D004220:Disulfides / Q000737:chemistry; D004852:Epoxy Compounds / Q000737:chemistry*; D005027:Ethylene Oxide / Q000737:chemistry; D007202:Indicators and Reagents / Q000737:chemistry; D007477:Ions / Q000737:chemistry; D012680:Sensitivity and Specificity; D013440:Sulfides / Q000737:chemistry*; D053719:Tandem Mass Spectrometry / Q000379:methods*
chemical_list: D004220:Disulfides; D004852:Epoxy Compounds; D007202:Indicators and Reagents; D007477:Ions; D013440:Sulfides; C054170:dimethyl trisulfide; C024370:3,4-epoxy-1-butene; D005027:Ethylene Oxide